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LTC1049 Low Power Zero-Drift Operational Amplifier with Internal Capacitors
FEATURES

DESCRIPTIO
Low Supply Current: 200A No External Components Required Maximum Offset Voltage: 10V Maximum Offset Voltage Drift: 0.1V/C Single Supply Operation: 4.75V to 16V Input Common Mode Range Includes Ground Output Swings to Ground Typical Overload Recovery Time: 6ms Available in 8-Pin SO and PDIP Packages
The LTC(R)1049 is a high performance, low power zero-drift operational amplifier. The two sample-and-hold capacitors usually required externally by other chopper stabilized amplifiers are integrated on the chip. Further, the LTC1049 offers superior DC and AC performance with a nominal supply current of only 200A. The LTC1049 has a typical offset voltage of 2V, drift of 0.02V/C, 0.1Hz to 10Hz input noise voltage of 3VP-P and typical voltage gain of 160dB. The slew rate is 0.8V/s with a gain bandwidth product of 0.8MHz. Overload recovery time from a saturation condition is 6ms, a significant improvement over chopper amplifiers using external capacitors. The LTC1049 is available in a standard 8-pin plastic dual in line, as well as an 8-pin SO package. The LTC1049 can be a plug-in replacement for most standard op amps with improved DC performance and substantial power savings.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
APPLICATIO S

4mA to 20mA Current Loops Thermocouple Amplifiers Electronic Scales Medical Instrumentation Strain Gauge Amplifiers High Resolution Data Acquisition
TYPICAL APPLICATIO
Single Supply Thermocouple Amplifier
0.068F VIN = 5V 246k
1k 2 K LT 1025A GND 4 R- 5
(R)
2 3
- +
7 6 VOUT = 0V TO 4V FOR 0C TO 400C
LTC1049 7
-
+
4
0.1F TYPE K SUPPLY CURRENT = 280A
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LTC1049 * TA01
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LTC1049
ABSOLUTE
AXI U
RATI GS
Total Supply Voltage (V + to V -) ............................... 18V Input Voltage (Note 2) .......... (V + + 0.3V) to (V - - 0.3V) Output Short-Circuit Duration .......................... Indefinite
PACKAGE/ORDER I FOR ATIO
TOP VIEW NC 1 -IN 2 +IN 3 V- 4 8 7 6 5 NC V+ OUT NC
ORDER PART NUMBER LTC1049CN8
+IN 2 V- 3 4
N8 PACKAGE 8-LEAD PDIP TJMAX = 110C, JA = 130C/W J8 PACKAGE 8-LEAD CERDIP TJMAX = 150C, JA = 100C/W
LTC1049CJ8
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 110C, JA = 200C/W
OBSOLETE PACKAGE
Consider the N8 Package as an Alternate Source
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER Input Offset Voltage Average Input Offset Drift Long Term Offset Voltage Drift Input Offset Current Input Bias Current CONDITIONS (Note 3) (Note 3)
The denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 5V, unless noted.
MIN

Input Noise Voltage Input Noise Current Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing
0.1Hz to 10Hz 0.1Hz to 1Hz f = 10Hz (Note 4) VCM = V - to 2.7V VS = 2.375V to 8V RL = 100k, VOUT = 4.75V RL = 10k RL = 100k RL = 10k, CL = 50pF No Load

Slew Rate Gain Bandwidth Product Supply Current Internal Sampling Frequency
2
+ -
U
U
W
WW
U
W
(Note 1)
Operating Temperature Range .................-40C to 85C Storage Temperature Range ................. -65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
NC -IN 1
TOP VIEW 8 7 6 5
NC V+ OUT NC
ORDER PART NUMBER LTC1049CS8
S8 PART MARKING 1049
TYP 2 0.02 50 30 15 3 1 2 130 130 160 -4.9/4.2 4.97 0.8 0.8 200 700
MAX 10 0.1 100 150 50 150
110 110 130 -4.6/3.2 4.9
330 495
UNITS V V/C nVmo pA pA pA pA V P-P V P-P fAHz dB dB dB V V V V/s MHz A A Hz
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LTC1049
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Connecting any terminal to voltages greater than V + or less than V - may cause destructive latch-up. It is recommended that no sources operating from external supplies be applied prior to power-up of the LTC1049. Note 3: These parameters are guaranteed by design. Thermocouple effects preclude measurement of these voltage levels in high speed automatic test systems. VOS is measured to a limit determined by test equipment capability. Note 4: Current Noise is calculated from the formula: IN = (2q * Ib) where q = 1.6 * 10-19 Coulomb.
TYPICAL PERFOR A CE CHARACTERISTICS
Voltage Noise vs Frequency
140 120
COMMON MODE VOLTAGE (V)
VOLTAGE NOISE (nV/Hz)
VOLTAGE GAIN (dB)
100 80 60 40 20 10 100 1k FREQUENCY (Hz)
LTC1049 * TP01
10k
Supply Current vs Supply Voltage
500
400
SHORT-CIRCUIT OUTPUT CURRENT (mA)
SUPPLY CURRENT (A)
340 280 220 160 100 5 6 7 8 9 10 11 12 13 14 15 TOTAL SUPPLY VOLTAGE (V)
LTC1049 * TPC04
SUPPLY CURRENT (A)
UW
Common Mode Input Range vs Supply Voltage
8 6 4 2 0 -2 -4 -6 -8
100k
Gain/Phase vs Frequency
120 VS = 5V 100 NO LOAD 80 PHASE 60 40 GAIN 20 0 -20 160 180 200 1k 10k 100k FREQUENCY (Hz) 1M 220 10M
LTC1049 * TPC03
VCM = V -
60 80
PHASE SHIFT (DEGREES)
100 120 140
0
1
4 5 2 3 6 SUPPLY VOLTAGE (V)
7
8
-40 100
LTC1049 * TPC02
Supply Current vs Temperature
1.2 0.8 0.4 0 -3 -6 -9
Output Short-Circuit Current vs Supply Voltage
400
300
200
100
0 -50 -25
50 25 0 75 TEMPERATURE (C)
100
125
4
14 8 10 12 6 TOTAL SUPPLY VOLTAGE, V+ TO V-(V)
16
LTC1049 * TPC05
LTC1049 * TPC06
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LTC1049 TYPICAL PERFOR A CE CHARACTERISTICS
Sampling Frequency vs Supply Voltage
3000
5
2500
SAMPLING FREQUENCY (kHz)
SAMPLING FREQUENCY (Hz)
2000
CMRR (dB)
1500
1000 4 14 16 6 8 10 12 TOTAL SUPPLY VOLTAGE, V + TO V - (V)
LTC1049 * TPC07
Overload Recovery
400mV
0.2V/DIV 0V 0V 2V/DIV -5V AV = -100 VS = 5V 0.5ms/DIV
LTC1049 * TPC10
VS = 5V
NOISE VOLTAGE 1V/DIV
4
UW
Sampling Frequency vs Temperature
VS = 5V
CMRR vs Frequency
160 140 VS = 5V
4
120
3
100 80 60 40 20
2
1
0 50 25 0 75 100 -50 -25 AMBIENT TEMPERATURE (C)
125
0 1 10 100 1k FREQUENCY (Hz) 10k 100k
LTC1049 * TPC08
LTC1049 * TPC09
Small-Signal Transient Response
Large-Signal Transient Response
INPUT OUTPUT
100mV STEP
6V STEP
1s/DIV
5s/DIV
AV = 1 RL = 10k CL = 50pF VS = 5V
LTC1049 * TPC11
AV = 1 RL = 10k CL = 50pF VS = 5V
LTC1049 * TPC12
LTC1049 DC to 1Hz Noise
1Hz NOISE 1V/DIV
10s/DIV
LTC1049 * TPC13
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LTC1049 TYPICAL PERFOR A CE CHARACTERISTICS
LTC1049 DC to 10Hz Noise
VS = 5V
NOISE VOLTAGE 1V/DIV
TEST CIRCUITS
Electrical Characteristics Test Circuit
140 120
COMMON MODE VOLTAGE (V)
VOLTAGE NOISE (nV/Hz)
100 80 60 40 20 10 100 1k FREQUENCY (Hz)
LTC1049 * TP01
UW
10Hz NOISE 1V/DIV
1s/DIV
LTC1049*TPC14
DC to 10Hz and DC to 1Hz Noise Test Circuit
8 6 4 2 0 -2 -4 -6 -8 VCM = V -
10k
100k
0
1
4 5 2 3 6 SUPPLY VOLTAGE (V)
7
8
LTC1049 * TPC02
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5
LTC1049
APPLICATIO S I FOR ATIO
ACHIEVING PICOAMPERE/MICROVOLT PERFORMANCE Picoamperes
In order to realize the picoampere level of accuracy of the LTC1049, proper care must be exercised. Leakage currents in circuitry external to the amplifier can significantly degrade performance. High quality insulation should be used (e.g., TeflonTM, Kel-F); cleaning of all insulating surfaces to remove fluxes and other residues will probably be necessary--particularly for high temperature performance. Surface coating may be necessary to provide a moisture barrier in high humidity environments. Board leakage can be minimized by encircling the input connections with a guard ring operated at a potential close to that of the inputs: in inverting configurations, the guard ring should be tied to ground; in noninverting connections, to the inverting input. Guarding both sides of the printed circuit board is required. Bulk leakage reduction depends on the guard ring width. Microvolts Thermocouple effects must be considered if the LTC1049's ultralow drift is to be fully utilized. Any connection of dissimilar metals forms a thermoelectric junction producing an electric potential which varies with temperature (Seebeck effect). As temperature sensors, thermocouples exploit this phenomenon to produce useful information. In low drift amplifier circuits the effect is a primary source of error. Connectors, switches, relay contacts, sockets, resistors, solder, and even copper wire are all candidates for thermal EMF generation. Junctions of copper wire from different manufacturers can generate thermal EMFs of 200nV/C -- twice the maximum drift specification of the LTC1049. The copper/kovar junction, formed when wire or printed circuit traces contact a package lead, has a thermal EMF of approximately 35V/C--300 times the maximum drift specification of the LTC1049.
6
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Minimizing thermal EMF-induced errors is possible if judicious attention is given to circuit board layout and component selection. It is good practice to minimize the number of junctions in the amplifier's input signal path. Avoid connectors, sockets, switches, and relays where possible. In instances where this is not possible, attempt to balance the number and type of junctions so that differential cancellation occurs. Doing this may involve deliberately introducing junctions to offset unavoidable junctions. PACKAGE-INDUCED OFFSET VOLTAGE Package-induced thermal EMF effects are another important source of errors. It arises at the copper/kovar junctions formed when wire or printed circuit traces contact a package lead. Like all the previously mentioned thermal EMF effects, it is outside the LTC1049's offset nulling loop and cannot be cancelled. The input offset voltage specification of the LTC1049 is actually set by the package-induced warm-up drift rather than by the circuit itself. The thermal time constant ranges from 0.5 to 3 minutes, depending on package type. LOW SUPPLY OPERATION The minimum supply for proper operation of the LTC1049 is typically below 4.0V (2.0V). In single supply applications, PSRR is guaranteed down to 4.7V (2.35V) to ensure proper operation down to the minimum TTL specified voltage of 4.75V. PIN COMPATIBILITY The LTC1049 is pin compatible with the 8-pin versions of 7650, 7652 and other chopper-stabilized amplifiers. The 7650 and 7652 require the use of two external capacitors connected to Pins 1 and 8 which are not needed for the LTC1049. Pins 1, 5, and 8 of the LTC1049 are not connected internally; thus, the LTC1049 can be a direct plugin for the 7650 and 7652, even if the two capacitors are left on the circuit board.
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LTC1049
TYPICAL APPLICATIO S
Low Power, Low Hold Step Sample-and-Hold
5V 13 LTC201 VIN 3 2 3 4.5 2 5V 7 6 LTC1049 VOUT
U
- +
4
S/H
1
0.47F MYLAR
DROOP 1mV/s HOLD STEP 20V IS = 250A TYP
LTC1049 * TA02
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7
LTC1049
TYPICAL APPLICATIO S
Low Power, Single Supply, Low Offset Instrumentation Amp
5V
8
U
198k
2k
2k
198k
2
- +
7 6
2
- +
7 6 VOUT
LTC1049 3 4
LTC1049 3 4
- VIN
+ VIN GAIN = 100 IS = 400A CMRR 60dB, WITH 0.1% RESISTORS (RESISTORS LIMITED)
LTC1049 * TA03
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LTC1049
PACKAGE DESCRIPTIO
CORNER LEADS OPTION (4 PLCS)
.045 - .068 (1.143 - 1.650) FULL LEAD OPTION .300 BSC (7.62 BSC)
.008 - .018 (0.203 - 0.457)
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS
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J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.405 (10.287) MAX 8 7 6 5 .005 (0.127) MIN .023 - .045 (0.584 - 1.143) HALF LEAD OPTION .025 (0.635) RAD TYP 1 2 3 .220 - .310 (5.588 - 7.874) 4 .200 (5.080) MAX .015 - .060 (0.381 - 1.524) 0 - 15 .045 - .065 (1.143 - 1.651) .014 - .026 (0.360 - 0.660) .100 (2.54) BSC .125 3.175 MIN
J8 0801
OBSOLETE PACKAGE
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LTC1049
PACKAGE DESCRIPTIO
.300 - .325 (7.620 - 8.255)
.008 - .015 (0.203 - 0.381)
(
+.035 .325 -.015 8.255 +0.889 -0.381
)
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
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N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400* (10.160) MAX 8 7 6 5 .255 .015* (6.477 0.381) 1 2 3 4 .130 .005 (3.302 0.127) .045 - .065 (1.143 - 1.651) .065 (1.651) TYP .120 (3.048) .020 MIN (0.508) MIN .018 .003 (0.457 0.076)
N8 1002
.100 (2.54) BSC
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LTC1049
PACKAGE DESCRIPTIO
.050 BSC 8
.245 MIN
.030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254) 0- 8 TYP
.016 - .050 (0.406 - 1.270) NOTE: 1. DIMENSIONS IN
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 - .197 (4.801 - 5.004) NOTE 3 7 6 5 .045 .005 .160 .005 .228 - .244 (5.791 - 6.197) .150 - .157 (3.810 - 3.988) NOTE 3 1 2 3 4 .053 - .069 (1.346 - 1.752) .004 - .010 (0.101 - 0.254) .014 - .019 (0.355 - 0.483) TYP .050 (1.270) BSC
SO8 0303
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LTC1049
TYPICAL APPLICATIO
6V V+ K
-
Thermocouple-Based Temperature to Frequency Converter
0.02F 6V 10k 100k LT1025 R NC Q1 2N3904
TYPE K THERMOCOUPLE
-+
GND
6.81k*
C3 0.47F
1.5k 100C TRIM
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
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-
LTC1049 1M Q2 2N3906 l1 C1 100pF l2 100k l3 OUTPUT 0 - 100C = 0 - 1kHz
+
C4 300pF 6V
240k
+
6.8F LT1004 - 1.2
16
9
15 S1
14 C2 390pF
11 S4
10
*IRC/TRW-MTR-5/+120ppm POLYSTYRENE = 74C14 IS = 360A SUPPLY RANGE = 4.5V to 10V
S3 2 3 6
S2 7 LTC201
1
8
LTC1049 * TA04
1049fb LT 0406 REV B * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 1991

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